Patients with mastocytosis often suffer from associated symptoms such as nausea, vertigo, fatigue, urticaria, abdominal cramps, diarrhea or hypotension due to release of mediators by mast cells. These patients have also an increased frequency of anaphylactic/anaphylactoid reactions due to allergens such as hymenoptera or nonspecific stimuli such as contrast media, local anesthetics or analgesics. In addition, there is increased osteoporosis in mastocytosis patients due to the activity of mast cell mediators on osteoblasts and osteoclasts. Symptoms of mastocytosis respond poorly to treatment with antihistamines or other antiallergic drugs. There is currently no specific treatment for this disease with the exception of rare cases. There are, however, some case reports suggesting that omalizumab might decrease symptoms including hypotensive events.

The aim of the study is to investigate whether patients suffering from mastocytosis benefit from a 6 month course of omalizumab with regard to symptoms and quality of life and whether the applied in vitro and in vivo monitoring tools represent useful surrogate markers for the efficacy of omalizumab in patients with mastocytosis.

The study will take place as double-blind placebo controlled study. After a first a run-period of 2 months for all participants randomization (1:1) in two group will take place:

Group A: With omalizumab treatment for 6 months; dosage and administration schedule according to body weight and total IgE level (1/2 of the patients). Group B: Placebo (1/2 of the patients). After 4 months of treatment in both groups patients are encouraged to stop all drugs given to reduce mast cell related effects, mainly antihistaminics . In case that disturbing symptoms are reoccurring patients are allowed to restart these drugs. The evaluation will take place after 5 months of treatment.

Finally, a follow up visit 1 and 4 months after the study will take place.

Eligibility

Ages Eligible for Study:

18 Years to 70 Years (Adult, Senior)

Genders Eligible for Study:

Both

Accepts Healthy Volunteers:

No

Criteria

Inclusion criteria:

Histological proven mastocytosis (cutaneous or systemic);

Diagnosis made by one marrow unction and/or skin biopsy or other histological work up;

Age: 18-70 years

Exclusion criteria

Age <18 years;

Known hypersensitivity to omalizumab or any of its components;

History of cancer in previous 5 years;

Patients with serious infections;

Patients with active tuberculosis or undergoing anti-TB therapy;

Patients currently treated with systemic immunosuppressive agents;

Female patients who are pregnant or breast feeding;Contraception must be performed by a save reliable and accept method such as oral or implanted contraceptives, intravaginal or male preservatives or permanent methods such as tubal ligation.

Patients with known positivity for human immunodeficiency virus (HIV). HIV screening will be performed by an HIV 1/2 Antibody-detection test.

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study.
To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01333293

Locations

Switzerland

University Hospital Berne (Insel) and Zieglerspital Berne

Berne, Switzerland

Geneva University Hospitals and Medical Faculty of the University of Geneva